Hydrogen absorption-desorption properties of hydrogen-absorbing MmNi 5-based alloy degradation by water vapor and after reactivation

Toshiyuki Hirosawa; Yutaka Sangu; Yohsuke Matsushita; Yoshio Morozumi; Hideyuki Aoki; Takatoshi Miura; Yoshiaki Kawakami

doi:10.1252/kakoronbunshu.33.376

Hydrogen absorption-desorption properties of hydrogen-absorbing MmNi ₅-based alloy degradation by water vapor and after reactivation

Toshiyuki Hirosawa, Yutaka Sangu, Yohsuke Matsushita, Yoshio Morozumi, Hideyuki Aoki, Takatoshi Miura, Yoshiaki Kawakami

ENG - Chemical Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

In this study, the effect of water vapor on the hydrogen absorption-desorption properties of a hydrogen- absorbing MmNi₅-based alloy (MmNi_4.04Mn_0.31Co_0.60Al_0.05) was investigated. When pure hydrogen used, the hydrogen-absorbing capacity decreased slightly with the number of absorption-desorption cycles. However, when hydrogen containing water vapor was used, the hydrogen-absorbing capacity decreased significantly, due to a decrease in the rate of hydrogen absorption-desorption, and the rate of absorption-desorption decreased with an increase in cycle number and water vapor concentration. After reactivation of the alloy, the hydrogen-absorbing capacity recovered. However, the hydrogen-desorbing capacity and the rate of hydrogen absorption-desorption did not increase significantly compared, with those before the reactivation. Thus, the reactivation tested in this study was effective only for hydrogen desorption from alloy was not completed, hydrogen desorption.

Original language	English
Pages (from-to)	376-382
Number of pages	7
Journal	kagaku kogaku ronbunshu
Volume	33
Issue number	4
DOIs	https://doi.org/10.1252/kakoronbunshu.33.376
Publication status	Published - 2007 Oct 29

Keywords

Degradation
Hydrogen-absorbing alloy
Reactivation
Water vapor

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)

Access to Document

10.1252/kakoronbunshu.33.376

Cite this

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title = "Hydrogen absorption-desorption properties of hydrogen-absorbing MmNi 5-based alloy degradation by water vapor and after reactivation",

abstract = "In this study, the effect of water vapor on the hydrogen absorption-desorption properties of a hydrogen- absorbing MmNi5-based alloy (MmNi4.04Mn0.31Co0.60Al0.05) was investigated. When pure hydrogen used, the hydrogen-absorbing capacity decreased slightly with the number of absorption-desorption cycles. However, when hydrogen containing water vapor was used, the hydrogen-absorbing capacity decreased significantly, due to a decrease in the rate of hydrogen absorption-desorption, and the rate of absorption-desorption decreased with an increase in cycle number and water vapor concentration. After reactivation of the alloy, the hydrogen-absorbing capacity recovered. However, the hydrogen-desorbing capacity and the rate of hydrogen absorption-desorption did not increase significantly compared, with those before the reactivation. Thus, the reactivation tested in this study was effective only for hydrogen desorption from alloy was not completed, hydrogen desorption.",

keywords = "Degradation, Hydrogen-absorbing alloy, Reactivation, Water vapor",

author = "Toshiyuki Hirosawa and Yutaka Sangu and Yohsuke Matsushita and Yoshio Morozumi and Hideyuki Aoki and Takatoshi Miura and Yoshiaki Kawakami",

year = "2007",

month = oct,

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doi = "10.1252/kakoronbunshu.33.376",

language = "English",

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T1 - Hydrogen absorption-desorption properties of hydrogen-absorbing MmNi 5-based alloy degradation by water vapor and after reactivation

AU - Hirosawa, Toshiyuki

AU - Sangu, Yutaka

AU - Matsushita, Yohsuke

AU - Morozumi, Yoshio

AU - Aoki, Hideyuki

AU - Miura, Takatoshi

AU - Kawakami, Yoshiaki

PY - 2007/10/29

Y1 - 2007/10/29

N2 - In this study, the effect of water vapor on the hydrogen absorption-desorption properties of a hydrogen- absorbing MmNi5-based alloy (MmNi4.04Mn0.31Co0.60Al0.05) was investigated. When pure hydrogen used, the hydrogen-absorbing capacity decreased slightly with the number of absorption-desorption cycles. However, when hydrogen containing water vapor was used, the hydrogen-absorbing capacity decreased significantly, due to a decrease in the rate of hydrogen absorption-desorption, and the rate of absorption-desorption decreased with an increase in cycle number and water vapor concentration. After reactivation of the alloy, the hydrogen-absorbing capacity recovered. However, the hydrogen-desorbing capacity and the rate of hydrogen absorption-desorption did not increase significantly compared, with those before the reactivation. Thus, the reactivation tested in this study was effective only for hydrogen desorption from alloy was not completed, hydrogen desorption.

AB - In this study, the effect of water vapor on the hydrogen absorption-desorption properties of a hydrogen- absorbing MmNi5-based alloy (MmNi4.04Mn0.31Co0.60Al0.05) was investigated. When pure hydrogen used, the hydrogen-absorbing capacity decreased slightly with the number of absorption-desorption cycles. However, when hydrogen containing water vapor was used, the hydrogen-absorbing capacity decreased significantly, due to a decrease in the rate of hydrogen absorption-desorption, and the rate of absorption-desorption decreased with an increase in cycle number and water vapor concentration. After reactivation of the alloy, the hydrogen-absorbing capacity recovered. However, the hydrogen-desorbing capacity and the rate of hydrogen absorption-desorption did not increase significantly compared, with those before the reactivation. Thus, the reactivation tested in this study was effective only for hydrogen desorption from alloy was not completed, hydrogen desorption.

KW - Degradation

KW - Hydrogen-absorbing alloy

KW - Reactivation

KW - Water vapor

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